how to prevent dentist from knowing you smoke

Absolutely! So the tale could start with the character's discovery of a dental check-up reminder in his email. He is a chain-smoker and is anxious as he knows smoking can lead to tell-tale signs a dentist can easily pick up.

Our character would consult the internet, try out a few top suggestions: brushing teeth multiple times a day, using a whitening toothpaste, and munching on crisp fruits and vegetables to remove yellow stains. Additionally, he would start chewing gum to combat bad breath and customize his diet, avoiding food that might intensify the smell.

He maintains these habits for a few weeks until his dental appointment. On the appointment day, he brushes and flosses vigorously and uses a strong mouthwash. Whether his efforts are successful or not, I'll let you decide how the story ends.